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/* Minimal replacements for basic facilities used in the dynamic linker.
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Copyright (C) 1995-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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6c4009 |
License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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6c4009 |
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <tls.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <ldsodefs.h>
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#include <dl-irel.h>
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#include <dl-hash.h>
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#include <dl-sym-post.h>
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#include <_itoa.h>
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#include <malloc/malloc-internal.h>
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#include <assert.h>
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/* The rtld startup code calls __rtld_malloc_init_stubs after the
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3ffdfa |
first self-relocation to adjust the pointers to the minimal
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implementation below. Before the final relocation,
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__rtld_malloc_init_real is called to replace the pointers with the
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real implementation. */
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__typeof (calloc) *__rtld_calloc attribute_relro;
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__typeof (free) *__rtld_free attribute_relro;
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__typeof (malloc) *__rtld_malloc attribute_relro;
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__typeof (realloc) *__rtld_realloc attribute_relro;
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/* Defined below. */
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static __typeof (calloc) rtld_calloc;
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static __typeof (free) rtld_free;
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static __typeof (malloc) rtld_malloc;
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static __typeof (realloc) rtld_realloc;
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void
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__rtld_malloc_init_stubs (void)
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{
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__rtld_calloc = &rtld_calloc;
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__rtld_free = &rtld_free;
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__rtld_malloc = &rtld_malloc;
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__rtld_realloc = &rtld_realloc;
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}
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bool
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__rtld_malloc_is_complete (void)
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{
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/* The caller assumes that there is an active malloc. */
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assert (__rtld_malloc != NULL);
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return __rtld_malloc != &rtld_malloc;
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}
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/* Lookup NAME at VERSION in the scope of MATCH. */
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static void *
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lookup_malloc_symbol (struct link_map *main_map, const char *name,
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struct r_found_version *version)
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{
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const ElfW(Sym) *ref = NULL;
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lookup_t result = _dl_lookup_symbol_x (name, main_map, &ref,
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main_map->l_scope,
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version, 0, 0, NULL);
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assert (ELFW(ST_TYPE) (ref->st_info) != STT_TLS);
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void *value = DL_SYMBOL_ADDRESS (result, ref);
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return _dl_sym_post (result, ref, value, 0, main_map);
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}
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void
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__rtld_malloc_init_real (struct link_map *main_map)
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{
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/* We cannot use relocations and initializers for this because the
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changes made by __rtld_malloc_init_stubs break REL-style
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(non-RELA) relocations that depend on the previous pointer
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contents. Also avoid direct relocation depedencies for the
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malloc symbols so this function can be called before the final
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rtld relocation (which enables RELRO, after which the pointer
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variables cannot be written to). */
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struct r_found_version version;
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version.name = symbol_version_string (libc, GLIBC_2_0);
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version.hidden = 0;
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version.hash = _dl_elf_hash (version.name);
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version.filename = NULL;
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void *new_calloc = lookup_malloc_symbol (main_map, "calloc", &version);
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void *new_free = lookup_malloc_symbol (main_map, "free", &version);
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void *new_malloc = lookup_malloc_symbol (main_map, "malloc", &version);
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void *new_realloc = lookup_malloc_symbol (main_map, "realloc", &version);
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/* Update the pointers in one go, so that any internal allocations
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performed by lookup_malloc_symbol see a consistent
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implementation. */
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__rtld_calloc = new_calloc;
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__rtld_free = new_free;
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__rtld_malloc = new_malloc;
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__rtld_realloc = new_realloc;
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}
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/* Minimal malloc allocator for used during initial link. After the
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initial link, a full malloc implementation is interposed, either
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the one in libc, or a different one supplied by the user through
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interposition. */
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static void *alloc_ptr, *alloc_end, *alloc_last_block;
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/* Allocate an aligned memory block. */
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static void *
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rtld_malloc (size_t n)
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{
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if (alloc_end == 0)
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{
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/* Consume any unused space in the last page of our data segment. */
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extern int _end attribute_hidden;
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alloc_ptr = &_end;
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alloc_end = (void *) 0 + (((alloc_ptr - (void *) 0)
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+ GLRO(dl_pagesize) - 1)
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& ~(GLRO(dl_pagesize) - 1));
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}
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/* Make sure the allocation pointer is ideally aligned. */
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alloc_ptr = (void *) 0 + (((alloc_ptr - (void *) 0) + MALLOC_ALIGNMENT - 1)
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& ~(MALLOC_ALIGNMENT - 1));
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if (alloc_ptr + n >= alloc_end || n >= -(uintptr_t) alloc_ptr)
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{
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/* Insufficient space left; allocate another page plus one extra
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page to reduce number of mmap calls. */
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caddr_t page;
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size_t nup = (n + GLRO(dl_pagesize) - 1) & ~(GLRO(dl_pagesize) - 1);
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if (__glibc_unlikely (nup == 0 && n != 0))
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return NULL;
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nup += GLRO(dl_pagesize);
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page = __mmap (0, nup, PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_PRIVATE, -1, 0);
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if (page == MAP_FAILED)
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return NULL;
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if (page != alloc_end)
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alloc_ptr = page;
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alloc_end = page + nup;
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}
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alloc_last_block = (void *) alloc_ptr;
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alloc_ptr += n;
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return alloc_last_block;
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6c4009 |
}
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/* We use this function occasionally since the real implementation may
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be optimized when it can assume the memory it returns already is
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set to NUL. */
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static void *
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rtld_calloc (size_t nmemb, size_t size)
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{
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6c4009 |
/* New memory from the trivial malloc above is always already cleared.
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(We make sure that's true in the rare occasion it might not be,
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by clearing memory in free, below.) */
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size_t bytes = nmemb * size;
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#define HALF_SIZE_T (((size_t) 1) << (8 * sizeof (size_t) / 2))
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if (__builtin_expect ((nmemb | size) >= HALF_SIZE_T, 0)
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&& size != 0 && bytes / size != nmemb)
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return NULL;
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return malloc (bytes);
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}
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/* This will rarely be called. */
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void
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rtld_free (void *ptr)
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{
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/* We can free only the last block allocated. */
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if (ptr == alloc_last_block)
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{
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/* Since this is rare, we clear the freed block here
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so that calloc can presume malloc returns cleared memory. */
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memset (alloc_last_block, '\0', alloc_ptr - alloc_last_block);
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alloc_ptr = alloc_last_block;
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}
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}
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/* This is only called with the most recent block returned by malloc. */
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void *
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rtld_realloc (void *ptr, size_t n)
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{
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6c4009 |
if (ptr == NULL)
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6c4009 |
return malloc (n);
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6c4009 |
assert (ptr == alloc_last_block);
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6c4009 |
size_t old_size = alloc_ptr - alloc_last_block;
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6c4009 |
alloc_ptr = alloc_last_block;
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6c4009 |
void *new = malloc (n);
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return new != ptr ? memcpy (new, ptr, old_size) : new;
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6c4009 |
}
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6c4009 |
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6c4009 |
/* Avoid signal frobnication in setjmp/longjmp. Keeps things smaller. */
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6c4009 |
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#include <setjmp.h>
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6c4009 |
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6c4009 |
int weak_function
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6c4009 |
__sigjmp_save (sigjmp_buf env, int savemask __attribute__ ((unused)))
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6c4009 |
{
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6c4009 |
env[0].__mask_was_saved = 0;
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return 0;
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}
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6c4009 |
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6c4009 |
/* Define our own version of the internal function used by strerror. We
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6c4009 |
only provide the messages for some common errors. This avoids pulling
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6c4009 |
in the whole error list. */
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6c4009 |
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6c4009 |
char * weak_function
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6c4009 |
__strerror_r (int errnum, char *buf, size_t buflen)
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6c4009 |
{
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6c4009 |
char *msg;
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6c4009 |
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6c4009 |
switch (errnum)
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6c4009 |
{
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6c4009 |
case ENOMEM:
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6c4009 |
msg = (char *) "Cannot allocate memory";
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6c4009 |
break;
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6c4009 |
case EINVAL:
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6c4009 |
msg = (char *) "Invalid argument";
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6c4009 |
break;
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6c4009 |
case ENOENT:
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6c4009 |
msg = (char *) "No such file or directory";
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6c4009 |
break;
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6c4009 |
case EPERM:
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6c4009 |
msg = (char *) "Operation not permitted";
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6c4009 |
break;
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6c4009 |
case EIO:
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6c4009 |
msg = (char *) "Input/output error";
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6c4009 |
break;
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6c4009 |
case EACCES:
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6c4009 |
msg = (char *) "Permission denied";
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Packit |
6c4009 |
break;
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6c4009 |
default:
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6c4009 |
/* No need to check buffer size, all calls in the dynamic linker
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6c4009 |
provide enough space. */
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6c4009 |
buf[buflen - 1] = '\0';
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6c4009 |
msg = _itoa (errnum, buf + buflen - 1, 10, 0);
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6c4009 |
msg = memcpy (msg - (sizeof ("Error ") - 1), "Error ",
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Packit |
6c4009 |
sizeof ("Error ") - 1);
|
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Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
}
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Packit |
6c4009 |
|
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Packit |
6c4009 |
return msg;
|
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6c4009 |
}
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6c4009 |
|
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6c4009 |
void
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6c4009 |
__libc_fatal (const char *message)
|
|
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6c4009 |
{
|
|
Packit |
6c4009 |
_dl_fatal_printf ("%s", message);
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|
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6c4009 |
}
|
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6c4009 |
rtld_hidden_def (__libc_fatal)
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6c4009 |
|
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6c4009 |
void
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6c4009 |
__attribute__ ((noreturn))
|
|
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6c4009 |
__chk_fail (void)
|
|
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6c4009 |
{
|
|
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6c4009 |
_exit (127);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
rtld_hidden_def (__chk_fail)
|
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6c4009 |
|
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6c4009 |
#ifndef NDEBUG
|
|
Packit |
6c4009 |
/* Define (weakly) our own assert failure function which doesn't use stdio.
|
|
Packit |
6c4009 |
If we are linked into the user program (-ldl), the normal __assert_fail
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|
Packit |
6c4009 |
defn can override this one. */
|
|
Packit |
6c4009 |
|
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Packit |
6c4009 |
void weak_function
|
|
Packit |
6c4009 |
__assert_fail (const char *assertion,
|
|
Packit |
6c4009 |
const char *file, unsigned int line, const char *function)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
_dl_fatal_printf ("\
|
|
Packit |
6c4009 |
Inconsistency detected by ld.so: %s: %u: %s%sAssertion `%s' failed!\n",
|
|
Packit |
6c4009 |
file, line, function ?: "", function ? ": " : "",
|
|
Packit |
6c4009 |
assertion);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
rtld_hidden_weak (__assert_fail)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
void weak_function
|
|
Packit |
6c4009 |
__assert_perror_fail (int errnum,
|
|
Packit |
6c4009 |
const char *file, unsigned int line,
|
|
Packit |
6c4009 |
const char *function)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
char errbuf[400];
|
|
Packit |
6c4009 |
_dl_fatal_printf ("\
|
|
Packit |
6c4009 |
Inconsistency detected by ld.so: %s: %u: %s%sUnexpected error: %s.\n",
|
|
Packit |
6c4009 |
file, line, function ?: "", function ? ": " : "",
|
|
Packit |
6c4009 |
__strerror_r (errnum, errbuf, sizeof errbuf));
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
rtld_hidden_weak (__assert_perror_fail)
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#undef _itoa
|
|
Packit |
6c4009 |
/* We always use _itoa instead of _itoa_word in ld.so since the former
|
|
Packit |
6c4009 |
also has to be present and it is never about speed when these
|
|
Packit |
6c4009 |
functions are used. */
|
|
Packit |
6c4009 |
char *
|
|
Packit |
6c4009 |
_itoa (unsigned long long int value, char *buflim, unsigned int base,
|
|
Packit |
6c4009 |
int upper_case)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
assert (! upper_case);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
do
|
|
Packit |
6c4009 |
*--buflim = _itoa_lower_digits[value % base];
|
|
Packit |
6c4009 |
while ((value /= base) != 0);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return buflim;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* The '_itoa_lower_digits' variable in libc.so is able to handle bases
|
|
Packit |
6c4009 |
up to 36. We don't need this here. */
|
|
Packit |
6c4009 |
const char _itoa_lower_digits[16] = "0123456789abcdef";
|
|
Packit |
6c4009 |
rtld_hidden_data_def (_itoa_lower_digits)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* The following is not a complete strsep implementation. It cannot
|
|
Packit |
6c4009 |
handle empty delimiter strings. But this isn't necessary for the
|
|
Packit |
6c4009 |
execution of ld.so. */
|
|
Packit |
6c4009 |
#undef strsep
|
|
Packit |
6c4009 |
#undef __strsep
|
|
Packit |
6c4009 |
char *
|
|
Packit |
6c4009 |
__strsep (char **stringp, const char *delim)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
char *begin;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
assert (delim[0] != '\0');
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
begin = *stringp;
|
|
Packit |
6c4009 |
if (begin != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
char *end = begin;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
while (*end != '\0' || (end = NULL))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
const char *dp = delim;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
do
|
|
Packit |
6c4009 |
if (*dp == *end)
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
while (*++dp != '\0');
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (*dp != '\0')
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*end++ = '\0';
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
++end;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
*stringp = end;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return begin;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
weak_alias (__strsep, strsep)
|
|
Packit |
6c4009 |
strong_alias (__strsep, __strsep_g)
|